Induction disk motor



May 18, 1937.

INDUCTION DISK MOTOR File d May 11, 1955 H. E. YOUNG 1 2,080992 Patented May 1937 UNITED STATES.

PATENT OFFICE zclaims.

This invention relates to induction motors, and more particularly to an induction motor of the rotating disk type for operating contacts or other purposes.

My invention is directed to the provision of a motor of the character stated, which is of simple and inexpensive construction and the speed of which can be varied as desired, within limits.

More specifically, it is an object to provide simple and inexpensive means for mounting the electro-magnet, associated with the rotating disk, in such manner as to permit of manual and direct rotation of the core member, without necessity of providing further intervening mechanisms for adjusting the shaded portion of the core. Further objects and advantages will appear from the ,detail description In the drawing:-

Figure 1 is a vertical sectional view of the motor and associated contacts, embodying my invention;

Figure 2 isa sectional view taken substantially on line 2-2 of Figure 1; and

Figure 3 is a sectional view, on an enlarged r scale, taken substantially on line 3-4 of Figure 1. I

In the particular embodiment of the invention illustrated the motor comprises an electro-magnet the windings or coil i2 of which is energized from a source of alternating current in a known manner. The inagnet 12 has a core it having one face thereof adjacent a conducting disk l1, which disk may be made of aluminum, for example. This disk is non-rotatably mounted on a shaft It, which shaft is journalled in suitable bearings, as the bearings I! and in the box or casing 2|. The shaft i8 has non'-rotatab1y mounted thereon a pair of eccentrics 22 and 23, which eccentrics are adapted to operate contacts 24 and 26, which cooperate with contacts '25 and 21, respectively; which may control suitable electrical circuits.

The particular details of the construction of the magnet and core, enabling the speed of the motor to be manually adjusted. will now be more fully described. The end of the core I adjacent the disk 11 has a projecting segmental portion 42, which portion is here shown as a substantially 90 wedge-shaped segment. This segment is eccentrically located-with respect to the axis of the core Ii, as is illustrated in Fig. 3.

This projecting segment is surroimde'd with a shading coil or copper ring 43, which serves to effect a phase ,diilerence between the flow of the magnetic flux through the projecting segment of the core and the flux flowing through the remainder of the core. This diiference in the phase of the flow of the magnetic flux sets up eddy currents in the aluminum disk I1, and thus causes the disk to rotate.

The core piece It, forexample, inay be continued beyond the magnet windings l2 to the outside of the box 2i, where it ends in a knurled knob or manual adjustment 44. The entire magnet is thus rotatably mounted with respect to the box and the disk I1, and a spring washer 45 is provided between the end of the magnet winding l2 and the wall of the box 2i. Manual rotation or adjustment of the position of the projecting segment with respect to the axis of the core may thus be made, the spring washer serving to maintain the desired position through its frictional contact. 7

The direction of the force developed by the changing magnetic flux is, of course, always in line with a line between the eifective center of the projecting segment 42 and the center of flux concentration through the remainder of the pole it. This flux center would substantially coincide v with the axis of the pole where the segnient is relatively a small portion of the face of the pole adjacent the disk 11. When theline between the electrical center of the segment and the electrical center of the pole is perpendicular to the radius of the disk at that point the greatest turning or t rotating force will be applied to the disk; while when this line is parallel to the radius no rotating effect will be exerted upon the disk. Since the direction of this line may be manually changed the component of force perpendicular to the radius, which is the component eifjective in rotating the disk, may be varied. Variation of this component, of course, varies the rate of speed of rotation of the disk IT. This change of speed is achieved without the use of any additional resistances, speed changing gears, or any other additional apparatus. Since the resistance of the spring member 46 which supports the contact 24, and the resistance of the similar spring member supporting the contact 26, provides a practically constant resistance to the rotation of the eccentrics 22 and 23, and hence to the rotation of the disk ii, the rate of speed of rotation of the disk I! is substantially directly proportional to the component of force exerted perpendicular to the radius thereof.

While I have shown and described certain embodiments of my invention, it is to be understood that it is capable of many modifications.

Changes, therefore, in the construction and arrangement may be made without departing from the spirit and scope of the invention as disclosed in the appended claims, in which it is my intention to claim all noveit inherent in my invention as broadly as possibl in view of the prior art.

What I claim as new, and desire to secure by Letters Patent, is:

'1. In an induction disk motor, a casing, a conducting disk rotatably mounted in said casing, an electro-magnet comprising a core and a surrounding winding projecting inward from a wall of the casing, the inner end of the core being in proximity to one face of said disk and provided with an eccentric lengthwise projection of reduced cross-section, a shading coil disposed about said projection, the outer end portion of said core being rotatably mounted through said wall, and means mounting said eiectro-magnet on said wall and holding it against endwise movement ner face of said wall.

comprising a handle secured upon the outer end of said core for rotating the latter and cooperating with said wall for preventing relative inward movement 01 said core.

2. In an induction disk motor, a casing, a conducting disk rotatably mounted in said casing, an electro-magnet comprising a core and a surrounding winding projecting inward irom a wall of the casing, the inner end of the core being in proximity to one face of said disk and provided with an eccentric lengthwise projection of reduced cross-section, a shading coil disposed about said projection, the outer end portion of said core being rotatably mounted through said wall,

'a knob secured upon the outer end of said core and abutting the outer face of said wall, and a resilient member confined under compression between the outer end of said winding and the in- HUGH E. YOUNG. 

